How about two years at Indy, two years at Austin, two years at Miller, two years at Infineon, two years at Road Atlanta, two years at MidO? All Runoffs being one practice, two qualifying races - done over three days? Who would go?
One thing about the Runoffs is that you can pretty well guarantee that you will be racing against the best of the best. There might also be a whole lot of racers who aren't the best, but enjoy the experience of the event. That is why I have been going for something like 14 years.
To Dave's question about demographics of SCCA. Approximate membership by Division: CN 3,500 - GL, 5,000 - MW, 3,000 - NE, 10,000 - NP, 5,200 - RM, 1,800 - SE, 8,200 - SP, 3,200 - SW, 2,200
As of the start of the season, there were: (N is National license holders, R is regional)
CN, 391 N, 59 R -
GL, 370 N, 104 R -
MW, 196 N, 57 R -
NE, 1027 N, 611 R -
NP, 454 N, 349 R -
RM, 178 N, 38 R -
SE, 976 N, 688 R -
SP, 280 N, 96 R -
SW, 289 N, 2081 R